1862-American Civil War-The Battle of South Mountain, part of the Maryland Campaign, is fought.

1901-President of the United States William McKinley-dies after an Assassination of William McKinley|assassination attempt on September 6, and is succeeded by Theodore Roosevelt.

1917-Russia is officially proclaimed a republic-

1939-World War II-The Estonian military boards the Polish submarine {{ship|ORP|Orzeł|1938|6}} in Tallinn, sparking a Orzeł incident|diplomatic incident that the Soviet Union will later use to justify the annexation of Estonia.

2001-Historic National Prayer Service held at Washington National Cathedral-for victims of the September 11, 2001 attacks|September 11 attacks. A similar service is held in Canada on Parliament Hill, the largest vigil ever held in the nation's capital.